US4528477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CRT with optical window
Assignee: Philips North America LLC
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Filing: 1982-12-10
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Granted: 1985-07-09
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Expires: 2002-12-10
Abstract
Abstract Cathode ray tubes with optical windows in the sidewall or funnel portion thereof are provided with transparent conductive films of metal oxide on the inner surface of the funnel in the window area. Such films provide electrical continuity with the internal conductive coating of the tube, while permitting optical viewing. The films are produced by in-situ pyrolysis of films of metal resiantes in organic solvents.
Inventors
- 👤 Anthony V. Gallaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:03
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/88; H01J2229/00; H01J2229/88; H01J2229/882
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
In a cathode ray tube having an envelope formed of a sealed integration of neck, funnel and panel portions providing an enclosure for structural components including a multi-electrode electron gun assembly located in said neck portion in a manner to project at least one electron beam to traverse a multi-apertured member and impinge upon a cathodoluminescent screen disposed on the interior surface of said panel, a getter assembly, the funnel portion containing external and internal electrically conductive coatings interrupted in at least one area to define a clear window in the funnel wall; and an adherent electrically conductive, transparent metal oxide layer on the interior surface of the funnel wall completely covering the clear window, and making electrical contact with the internal conductive coating.
Claim 2
Dependent Claim
124 words
In a cathode ray tube having an envelope formed of a sealed integration of neck, funnel and panel portions providing an enclosure for structural components including a multi-electrode electron gun assembly located in said neck portion in a manner to project at least one electron beam to traverse a multi-apertured member and impinge upon a cathodoluminescent screen disposed on the interior surface of said panel, a getter assembly, the funnel portion containing external and internal electrically conductive coatings interrupted in at least one area to define a clear window in the funnel wall; and an adherent electrically conductive, transparent metal oxide layer on the interior surface of the funnel wall completely covering the clear window, and making electrical contact with the internal conductive coating.
Claim 3
Dependent Claim
20 words
The metal oxide layer of claim 1 wherein the metal oxide comprises a composition of tin oxide and antimony oxide.
Claim 4
Dependent Claim
35 words
The metal oxide layer of claim 1 wherein the composition has tin oxide and antimony oxide in the weight ratio within the range of from about 1:1 to 70:1 of tin oxide to antimony oxide.
Claim 5
Dependent Claim
22 words
The layer of claim 2 in which the weight ratio of tin oxide to antimony oxide is from about 1.1:1 to 2.6:1.
Claim 6
Dependent Claim
16 words
The metal oxide layer of claim 1 evidencing an electrical resistivity of up to 1000 megohms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |